main()
{
    int a, b, c, count=0;
    printf("There are different methods for XM to distribute books to 3 readers:\n");
    for (a=1;a<=5;a++)
     for (b=1; b<=5; b++)
      for (c=1; a!=b&&c<=5;c++)
    if(c!=a&&c!=b)

    printf( count%8?"%2d:%d,%d,%d":"%2d:%d,%d,%d\n",++count,a,b,c);
}